The article deals with the analysis of chromium-molybdenum steel (ASTM A335 Grd. P5) joints after post weld heat treatment. The finished welds typically exhibit high levels of tensile residual stresses. The risk of weld failure may be alleviated by reducing the magnitude of the tensile residual stresses. The objective of the research program outlined in this paper is to develop a short-term postweld heat treatment procedure than can be used to produce the highest values of strength-related characteristics of welded joint. The article materials present the investigation of the strength-related characteristics dependence on temperature-time parameter P. The welded joints samples were heat treated by tempering mode. When performing post weld heat treatment, the temperature was changed from 500 to 800 degrees C and the exposure (hold) time was changed from 1 to 8 hours. The chosen tempering parameters were to ensure the value of the temperature and time parameter was from 15.5 to 22.5. After post-weld heat treatment each sample was tested subject to tensile, yield and impact strength
